Patent GB-303764-A (GB)
Title: Process and apparatus for the production of multicolour representations
IPC: B41M1/14
Filed: 1927-10-06
Abstract: 303,764. Rado, L. Oct. 6, 1927. Printing-surfaces; polychromatic and like self-contained colour or absorbent blocks or surfaces; stencilling; cylinder machines; rotary machines.-In apparatus for printing multi-colour representations, pictures, or texts by means of a printing-block part of which prints in the normal colour and the remaining part of which prints in other colours and wherein the movement of part of the block at right angles to the surface to be printed causes the parts of the block not already at the level of the normal type to be brought to that level, the movement is caused entirely by the action of an impression roller on that part. In a modification, the part printing in the normal colour is of normal type height and is moved below that height by the impression roller. In one form, Fig. 1, a printing-block 1 shaped like a frame surrounds a printing-pad comprising a receptacle 52 containing a pasty ink 53 pressed by a spring 56 against a fabric screen 54 stretched over the mouth of the receptacle by means of a ring 55. The block 1 is supported by springs 3 adapted to allow the block to be depressed into line with the pad by an impression roller but stiff enough to retain the block in the raised position during inking. In a modification, Fig. 2 (not shown) the block 1 is supported on the ends of rubber sleeves inside which are bellows communicating with other bellows arranged under the receptacle 52, so that when the block 1 is depressed the pad is raised. The screen 54, in this case, is replaced by a stencil, which may also be used in the other forms described. In a second modification, Fig. 3 (not shown), the device shown in Fig. 1 is mounted in a recess in a rotary printing-cylinder, and in a third modification, Fig. 4 (not shown), the pad 53 is replaced by a multi-colour unit consisting of concentric ring-shaped pads surrounding a central pad. In the construction shown in Fig. 5, an outer member consists of parallel bars 1 supported by posts 73 resting on springs 3, and the inner member is a polygonal block, which is raised through levers 74 when the outer member is depressed, and is rotated by a pawl 75 to bring a fresh face into operation every time the block is lowered. The block and its faces may be exchangeable, and each side may consist of several differently coloured parts and may be grooved to receive types. Fig. 7 shows another form comprising a rectangular block 1, which is supported by springs 3 and is provided with apertures to receive plungers 76 or rotatable polygonal blocks carried by a plate 77 to which it is connected through links 74 so that as the block 1 is depressed the plungers are raised. Fig. 9 shows a polygonal block 78 arranged with its inking-rollers 79 inside a printing-cylinder 83, a surrounding die 1 being movable inwardly against spring action by a raised part 81 of an impression cylinder 80; the block 78 may be moved round after each impression. The block 78 may be normally below the printing plane, and it may be raised by the movement of the die 1; ink receptacles may be substituted for the block 78.